Lever bearing and method of making same



Jan. 22, 1924.

- M. HELM LEVER BEARING AND METHOD OF MAKING SAME 4 Filed Aug. 24, 1921 Patented den. 22, 1924?- heldifidt PATENT @FFEQE.

MAX HELM, 0T1 NIEDERSCHONHAUSEN, NEAR BER-LIN, GERMANY.

LEVER BEARING AND liIETHOD OF MAKING SAME.

Application filed August 24, 1821.

Serial No. 494,972.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 11 STAT. II. 1 313.)

To all whom it may concern:

Be it known that 1, MAX HELM, a citizen of Germany, residing at Niederschonhausen, near Berlin, Germany, have invented certain new and useful Improvements in Lever Bearings and Methods of Making Same (for which I have filed applications in Germany, February 9, 191 .1, Pat. 289,775; Austria, January 2, 1915, Pat. 72,163; Hungary, January 12, 1915, Pat. 68,379; France, Jan. 1 1, 1915, Pat. 510,612; Italy, Jan. 28, 1915; England, Febr. 3, 1915, Pat. 1764/15; Sweden, June 29, 1920; Denmark, July 27, 1920; Belgium, July 10, 1920, Pat. 289,342; Czechoslovakia, Sept. 1, 1920, Pat. 3,806; Switzerland, Sept. 15, 1920, Pat. 90,318), of which the following is a specification.

My invention relates to a bearing for levers and particularly for the type, key and intermediate levers of typewriting and calculating machines, in which the levers are guided in slots in the bearing body. The invention also concerns a method of making such bearings. Its particular object is to improve such bearings so as to increase their strength and durability.

Hitherto the bearing body has been produced in various ways, such, for example, as cutting it from the solid, by assembling and screwing together separate elements and also by die casting or casting under pressure.

All these known methods presents certain defects. In manufacturing in accordance with the first method, in the case of segmental. bearing bodies with radial bearing slots, irregularities readily occur in the spacing of the separate bearing slots one from the other and in their width. As the bearing slot-s which have to be located towards the middle of the segmental bearing body are separated one from the other by only a small amount of material, the web separting them is liable to give and yield laterally under treatment. The second method of manufacture referred to presents the defect that the various elements must; be finished. very exactly in. order to obtain the correct mutual position. This finishing operation is costly but nevertheless it does not in all cases ensure the formation of a rigid whole. When die casting or casting under pressure is adopted, the lateral limiting faces of the bearing slots against which the type levers bear and with which they are in constant frictional contact, are reduced in strength owing to the softness of the material employed in the casting, so that speedy wear of the faces of the bearing slots occurs. Moreover, the long narrow webs between the bearing slots are not very strong owing to the material employed.

In accordance with the invention these lefects and particularly the defects, inherent in the method last referred to, are avoided by covering the lateral faces between, which the type levers are guided with a hard material such as sheet steel, for example, thereby at the same time strengthening the webs. The sheet steel disc forming the covering, are advantageously provided with projections, perforations, ledges and the like to assist their retention in the material cast around them. The dimensions of the several slots, each of which is constituted by a pair of discs, are obtained very exactly and maintaining owing to the fact that the corresponding discs are connected one with the other by the intermediary of distance pieces before they are inserted in the casting mould; this can be effected by riveting, by casting under pressure or by some other known method. it is advantageous to arrange vbetween the pair of discs the pivot for the type lever to be guided in the bearing slot that is being formed and this is done by providing one of the distance pieces which ensure the maintenance of the proper distance between the two discs with a rotatable roller which serves as the pivot for the type lever.

An embodiment of the invention is illus trated by way of example, in the accompanying drawings, in which Fig. 1 shows a bearing segment only partialiy lottcd and a type lever in elevation.

Fig. .3 is a cross-section through the ment on the median plane i s-1% of one of the slots, and

Fig. 3 shows a slot cover in front and s de el vation this covering consisting of two plates united one with the other before in sertion in the casting mould.

The bearing slots of the segment a are covered with plates 0 between which the type levers are rot-stably mounted their hearing rollers 72,. Before they are inserted in the mould in which the bearing body is cast, the two plates, each of which laterally covers a bearing slot, are connected one with the other by webs or bars (Z which are preferably cast under pressure. A steel pivot e which also unites the plates one with the other, carries between these plates a roller ]L which is also freely rotatable and upon which the type leversb are mounted by means of their slot.

The plates 6 are preferably chamfered at f and they are also provided withopenings and projections g which serve to retain them in themetal which is cast about themunder pressure.

I wish it to be understood that I do not desire to be limited to the-exact details of construction shown and described, for obvious modifications will occur to a; person skilled in the art.

I claim:

1. Bearing for the type bars and thelike of type-writing1 and other machines comprising in combination, a cast metal body with a plurality of closely adjoining slots and a pair of hard metal plates embedded and fixed in parallel position in the side walls of each slot.

2. Bearing for the type bars and'the like of type writing and other machines comprising, in combination, a cast metal segment with aplurality of radial closely adjoining slots and a pair of parallel. hard meta-l plates embedded in andspaced apart by the side walls of each slot.

3. Bearing for the type bars andthe like of type writing and other. machines comprising in. combination, a cast metal body with a plurality of closely adjoining slot-s, a pair of hard metal plates embedded and fixed in parallel position in the side walls of each slot and a spacer between and uniting the plates of each pair.

4. Bearing for the type bars and the like of type writing and other machines comprising in combination, a cast metal body with a plurality of closely adjoining slots, a pair of hard metal plates embedded and fixed in parallel position in the side walls of each slot and a hollow spacer between and uniting the plates of each pair.

5. Bea-ring tor the type bars and the like of type writing and other machines comprising in combination, a cast metal body with a plurality of closely adjoining slots a pair of hard metal plates embedded and fixed in parallel position in the side walls oieach slot and a solid and a hollow spacer between and uniting the plates of each pair.

6. The method of making bearings torthe type-bars and the like of type writing and similar machines, consisting in. assembling;- pairs of hard metal plates and a spacer be tween the plates of each pair so as to fix the plates of each pair in parallel position, placing; a plurality 0t such assembled pairs 1n predetermined position in a. mould and casting Inetalunder' pressure-in saidmonld so as to'unite said pairs of plates with the casting.

In testimony whereof I aflix my signature 

